Measuring device



Nov. 24 1925 J. G. SISSON MEASURING DEVICE Filed May l5. 1922 lll/ 5 Sheets-Sheet 1 J. G. SISSON MEASURING DEVICE s sheetsl-sheet 2 Filed May l5, 1922 igualmwflllllll/L gn/vento@ J l/@wow aiktoz weg J. G; SISSON MEASURING DEVICE Nov. 24I 1925 Filed May 15, i922 :s SheetS-sheet a attain/e1,

' citizen of the United States, residin Patented Nov. 24,4 1925.. i

UNITED ,STATES PATENT OFF-Ica,

TAKES G. vSISSON, OF ATHOL'MASSACHUSETTS.

. leaseauto nevica'.4

4 Application nled May 15, 1922. Serial No. 560,993.

To all whom t may concern.:

Be it known that I, JAMES G. SIssoN, a;

a Athol, in the county of Worcester and tate of Massachusetts, have invented 'certain new and useful Improvements inMeasuring -Devices, of which the following is a. specificaangles thereto adapted to engage the cone.

A further object is the provision of an instrument including a shaft carrying a movable member tor measuring the external diana-eter ofpiston rings.

In the accompanying drawings, ll have shown one embodiment ot the invention. lin this showing:

Figure 1 is a plan view,

Figure 2 is a central longitudinal sectional View,

Figure 3 is a similar view at right angles to Figure 2,

Figure 4 is a transverse sectional view on line e-d of Figure 1,

Figure 5 is a similar view online 5 5 of Figure 1, l I

Figure 6 is a similar view on llne 6-6 of Figure 1,

Figure 7 is a plan View of a portion of the instrument showing a piston ring in position to be measured,

Figure 8 is a detail view of a portion ot the piston ring measuring device,

Figure 9 is a detail perspective vicwpf the cone and shaft, and,

Figure 10 is a lan view ofa plurality of interchan cable slzing rods used in measurin cylin ers. K p

teferring to thedrawings, the reference numeral 1 designates the ody of the instrument'or handle, and consists of a hollow tubular member having a head 2 secured to one end in an suitable manner. A bushin 3 is arrange atrthe inner end of the hea .site sides of thesleeve an are adapted te and this bushing forms a bearing for a shaft 1 -which extendsinto the head. "The shaft `is provided with a cone vron its outer end and the face 6 of this cone is-at an an 1e of 45- tothe shaft, wherebylgithe cone de nes a v ri ht angle at its apex. *lflhehead is provi ed with a pair of oppositelv disposed openings, one o which is adapted to receive a bushing 7. This bushing is provided with a threaded opening for the reception of sizing rods 8. As shown in Figure 10 of the drawings, 'a plurality of sizing rods form a part of the instrument and are interchangeably mounted in the bushing 7. The sizing rods are provided with threaded ends 9. The opposite opening is adapted to receive a bushin 10 having a central opening there- `in for tie reception of a plunger 11. A spring 12 is arranged on the plunger within the head, one end of the spring bearing against the inner wall of the head and the other end bearing against a Washer or en .largement 13 at the inner end of the )lungen The shafti is provided with a tireaded opening at its inner endI adapted to receive the threaded end of an operating shaftf14. As shown, a lock nut 15 may be arranged on the operating shaft to retain the parts in position. The other end of the operating shaft is provided with an adjusting screw 16.` This adjusting screw is received ,in a

threaded opening 17 formed ina` member 18 secured to the outer end oi' the handle. A cap 19 is secured to the end of the operating shaft and iits over the member 18.. As shown, this cap( is provided with suitable graduations 20/ adapted to cooperate with a zero indication 21 formed on the member 1S to permit micrometer readings.

Means are'provided for determining the diameter of piston rings. As shown, a

late 22 is secured tothe exterior of the andle and` this plate is provided with a plurality of spaced measuring members 23 'arranged at a predetermined distance from each other. The handle is provided with a slot' 24 spaced from the plate 22, the adjacent endl of the slot being a definite and devices. A. slotted plate is arranged over the slot in the handle. A sleeve'26 is mounted on the operating shaft and this sleeve is provided with a projection 27 assing through the slot 24. A pair of was ers 28 t are secured to the operatm shaft on oppomore with the shaft to adjust the sleeve. A spring 29 may be arranged between one of the washers and the sleeve. The handle may further be provided with a plate secured thereto in any suitable manner, as by screws 31 and preferably arranged opposite the piston ring measuring device. This plate is employed for securing the instrument between the jaws of a vice when measuring piston rings and thus prevents injury to the handle of the instrument.

In operation, the proper sizing rod 8 iis' arranged in the busliinor 7. These sizing rods are of a predetermined length to give definite distances from the outer face of a given sizing i'od to the outer' face of the plunger when the micrometer scale is'at zero with the plunger engaging the cone adjacent its apex. A series of sizing rods shown are furnished to give readings from 21/2 inches to G inches, each-sizing rod being 1/2 inch longer than the next smallest one. The instrument is thus adjusted with the proper sizel rod t'o determine the size of the cylinder within 1A), inch andthe operating shaft is then drawn inwardly by revolving the cap 18, causing the plunger 1l to ride over `the cone toward its base and thus be projected. When the plunger is projected to the point where it engages the walllof the cylinder, the distance that it has been projected may be read upon the micrometer gauge 20 and 21 and the rsize of the cylinder may be determined to o ne-tliousandthof'an inch.

In measuring piston rings, the ringfl is arranfred as shown in Figure 7 of the draw-j ings, engaging one of the measuring devices 23. The ring is placed on themeasurlng -4)' device that will position the opposite side of the ring over the slot 24 and the projection 27 is arranged at the inner end of the slot, opposite to thc sliowing'inFi-gure 3 of the drawings. It is then adjusted inwardly by revolving the shaft until it engages the-l piston ring and the fraction of an inch over the size for the given member 23 may be read on the micrometer gauge. j

It will be apparent that I have provided a very simpleand eicient tool or instr-ument for measuring the size of piston rings and` the internal dlameter of cylinders and `that by means of the construction, it is possible to obtain micrometer readings or readings to very small fractions of an inch, thus permitting the greatest degree of accuracy when this instrument is employed.

It is to be understood that the form of my invention herewith shown and described A is to be taken as a preferred example of the saine, and that various changes in the shape, size, and arrangement of parts may be resorted to withoutdeparting from the spirit of the invention or the scope of the subjoined claim.

Having thus described my'invention, I claim: Y

In a device of the character described, a tubular member,'a head'mounted on one end of said member, a shaft mounted in said tubular member, a cone arranged in said head and having its apex secured to said shaft, said head being provided with oppositely disposed threaded openings, bushings mounted in said openings, one of said busliings being provided with a threaded opening, a removable sizing rod arranged therein, the other of said bushings being provided with an ripening, a plunger arranged therein andengaging said cone, a collar formed on said plunger adjacent said inner end, a spring surrounding said plunger and engaging said collar to oppose outward movement of said plunger, an interiorly threaded member arranged in the opposite end of said tubular member, said shaft being rovided with y a threadedl portion engaging the threads of said member, and a cap carried by said shaft and arranged over the end of said interiorlythreaded. member, said .threaded member and saidcap being provided with indicia to permit calculation of the movement of said shaft and consequent projection of said plunger.

A In testimony whereof, I aflix my signature.`

JAMES e. sissoN. 

